8-Bit, Programmable 2- to 3-Phase Synchronous Buck Controller
The ADP3293 is a highly efficient, multi?phase, synchronous buck
switching regulator controller optimized for converting a 12 V main
supply voltage into the core supply voltage of high performance Intel
processors. It uses an internal 8?bit DAC to read a voltage
identification (VID) code directly from the processor, to set the output
voltage between 0.5 V and 1.6 V.
This device uses a multi?mode control architecture to drive the
logic?level PWM outputs. The switching frequency can be
programmed according to VR size and efficiency. The chip can
provide 2? or 3?phase operation, allowing for the construction of up to
four complementary buck switching stages.
The ADP3293 also includes programmable no load offset and load
line slope setting function that adjusts the output voltage as a function
of the load current, optimally positioning it for a system transient. The
ADP3293 also provides accurate and reliable short?circuit protection,
adjustable current limit, and a delayed power?good output that
accommodates on?the?fly output voltage changes requested by the
CPU.